If you knit, at some point or another, you're going to need stitch markers. Now, you can buy the fairly uninspired plastic rings, and they do the job fine. You can use things around the house like safety pins, colored string, or (if you're like me) a broken earring that's still too pretty to get rid of.
But if you find yourself in need of a little "knitting jewelry", you'll get some of these:
Aren't they cute? You can get all sorts like these on etsy or make them yourself.
These are the ones I made for Mum:
All of mine were made with some beads from Grandmom and beads from the girls' stash. They didn't seem to mind...